From e596cf6e93dbf121e197cccfec8a69902e00eda3 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john.hawthorn@shopify.com>
Date: Wed, 28 May 2025 10:11:58 -0700
Subject: Make FrozenCore a plain T_CLASS

---
 gc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'gc.c')

diff --git a/gc.c b/gc.c
index 6c230d7820..9b218934b4 100644
--- a/gc.c
+++ b/gc.c
@@ -1491,7 +1491,10 @@ internal_object_p(VALUE obj)
           case T_ZOMBIE:
             break;
           case T_CLASS:
-            if (!RBASIC(obj)->klass) break;
+            if (obj == rb_mRubyVMFrozenCore)
+                return 1;
+
+            if (!RBASIC_CLASS(obj)) break;
             if (RCLASS_SINGLETON_P(obj)) {
                 return rb_singleton_class_internal_p(obj);
             }
-- 
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